Eraser cleaner



March 21, 1939. c. E. BRUCE 2,151,372

ERASER CLEANER Filed Sept. 11, 1936 2 Sheets-Sheet l INVENTOR ATTORN EYS March 21, 1939. c BRUCE 2,151,372

ERASER CLEANER Filed Sept. 11, 1936 2 Sheets-Sheet 2 INVEINTOR ATTORNEYS Patented Mar. 21, 1939 2,1

UNITED STATES PATENT OFFICE ERASER CLEANER Charles E. Bruce, Marshalltown, Iowa Application September 11, 1936, Serial No. 100,373

1 Claim. (01. 15-21 This invention relates to devices especially motor so that by the movement of the erasers adapted for cleaning erasers employed in schools between said brushes foreign matter will be or educational institutes for removing chalk, brushed therefrom. The shaft of one of the crayon and the like from black boards and has brushes has secured thereto a pinion l5 meshing 5 for the primary object, the provision of a device with a gear I6 secured to the lower drum of the 5 of the above stated character whereby a large conveyor 5 for the purpose of driving the connumber of erasers may be easily and quickly veyor to cause movement of the erasers downcleaned and the dirt and other foreign matter wardly between the brushes. removed therefrom may be collected and pre- A suitable suction fan I! is mounted on the 10 vented from scattering and thereby permit the front wall of the casing and below the brushes 10 cleaning operation to be readily carried out by in communication with the interior of the casing an unskilled person and with a minimum exand is provided with an outlet pipe 18 to which penditure of effort. a collecting receptacle I9 is attached so that the With this and other objects in view, this indirt and other foreign matter removed from the vention consists in certain novel features of conerasers by the brushes will be drawn or forced 15 struction, combination and arrangement of parts into the receptacle l9 by the suction of the fan. to be hereinafter more fully described and The fan is driven by an endless belt 20 trained claimed. over a pulley 2| secured to the shaft Id of the For a complete understanding of my invention, motor I 5. 20 reference is to be had to the following descrip- As the erasers pass from between the lower pair 20 tion and accompanying drawings, in which of brushes they gravitate onto the inclined por- Figure 1 is a vertical sectional view illustrating tions 3 of the wall 2 and are directed outwardly an eraser cleaner constructed in accordance with of the casing, thus it will be seen that a machine myinvention. has been provided whereby a large number of Figure 2 is a front elevation partly in section erasers may be fed therethrough in a short period 25 illustrating the same. of time and that when the erasers leave the Figure 3 is a rear elevation partly in section machine they will be free of dirt and other foreign illustrating the same. matter. It is to be understood that this machine Figure 4 is a top plan view illustrating the may be successfully operated by hand should device. electricity not be convenient by substituting a 30 Referring in detail to the drawings, the nucrank on the shaft I4 for the motor l5, also that meral I indicates a casing, the upper end of the speed of rotation of the brushes may be Which is fully p A W 2 s arranged in varied by changing the size of the drive pulley. the casing and is provided with oppositely in- Further it will be seen that a machine con-' 5 eli d Portions 3 for the p p f directing structed in accordance with the foregoing may erasers from the casing after being cleaned. A b conveniently operated by a person unskilled guard 4 rises from the wall 2 and outwardly and that the device is of a portable nature so t ou t pp e d o the casing and suppo that it may be conveniently carried from one an endless conveyor 5 provided with spaced lac to another.

40 fl hts 6- pa is v d d w n t upp While I have shown and described the pre- 40 e d f e Casing and the pp Portion of the ferred embodiment of my invention, it will be ghard to permit erasers 7 to be placed on e understood that minor changes in construction, fl hts for m v men dow wardly in th casing combination and arrangement of parts may be owa the W Pairs of brushes 8 are j made without departing from the spirit and scope nalled in the casing l with one run of the conof my i ti n, a claim d. 45 V y0r passing between Said Pairs of brushes- A Having thus described my invention, what I guard wall 9 is arranged in the casing l adjacent claim the front wall and the shafts of the brushes ex- An eraser cleaner comprising a casing open at tend therethrough and have secured thereon the upper end thereof and provided t grooved pulleys 10 over which is trained a drive charge openings i opposite sides and adjacent 50 belt II. The drive be t I is a trained Over the bottom of said casing, a wall arranged in the Spaced Idle P y l2 J'eur a in th casing casing and including oppositely inclined portions and about a drive pulley I3 secured to the shaft extending in the direction of said openings for I4 of an electric motor 15 mounted within the directing erasers from said casing by way of said casmg whereby the b us s r rotated by he openings, a. channeled guard carried by the wall 55 and rising therefrom outwardly of the casing and having a hood shaped upper end, a vertically arranged endless conveyor located in the guard and having one run'thereof located for moving erasers downwardly toward the wall and discharging the erasers on said wall and including a plurality of flights on which the erasersmay be placed, pairs' of rotary brushes engaging the erasers as they move toward the wall, said hood: shaped end of the guard being spaced from the upper end of the casing to permit the erasers to be positioned on the flights, and means for operating the brushes and conveyor.

CHARLES E. BRUCE. 

